RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
draft-ietf-avt-rtp-evrc-nw-07

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Network Working Group                                            Z. Fang
Internet-Draft                                                  Qualcomm
Intended status: Standards Track                         August 22, 2012
Expires: February 23, 2013

RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec
                               (EVRC-NW)
                     draft-ietf-avt-rtp-evrc-nw-07

Abstract

   This document specifies real-time transport protocol (RTP) payload
   formats to be used for the Enhanced Variable Rate Narrowband-Wideband
   Codec (EVRC-NW).  Three media type registrations are included for
   EVRC-NW RTP payload formats.  In addition, a file format is specified
   for transport of EVRC-NW speech data in storage mode applications
   such as e-mail.

Status of this Memo

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   This Internet-Draft will expire on February 23, 2013.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  EVRC-NW codec  . . . . . . . . . . . . . . . . . . . . . . . .  6
   5.  RTP header usage . . . . . . . . . . . . . . . . . . . . . . .  7
   6.  Payload format . . . . . . . . . . . . . . . . . . . . . . . .  8
     6.1.  Encoding capability identification in EVRC-NW
           interleaved/bundled format . . . . . . . . . . . . . . . .  8
   7.  Congestion Control Considerations  . . . . . . . . . . . . . . 11
   8.  Storage format for the EVRC-NW Codec . . . . . . . . . . . . . 12
   9.  IANA considerations  . . . . . . . . . . . . . . . . . . . . . 13
     9.1.  Media Type Registrations . . . . . . . . . . . . . . . . . 13
       9.1.1.  Registration of Media Type audio/EVRCNW  . . . . . . . 13
       9.1.2.  Registration of Media Type audio/EVRCNW0 . . . . . . . 15
       9.1.3.  Registration of Media Type audio/EVRCNW1 . . . . . . . 16
   10. SDP mode attributes for EVRC-NW  . . . . . . . . . . . . . . . 19
   11. Mode Change Request/Response Considerations  . . . . . . . . . 20
   12. Mapping EVRC-NW media type parameters into SDP . . . . . . . . 22
   13. Offer-Answer Model Considerations for EVRC-NW  . . . . . . . . 23
   14. Declarative SDP Considerations . . . . . . . . . . . . . . . . 25
   15. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
   16. Security Considerations  . . . . . . . . . . . . . . . . . . . 29
   17. References . . . . . . . . . . . . . . . . . . . . . . . . . . 30
     17.1. Normative References . . . . . . . . . . . . . . . . . . . 30
     17.2. Informative References . . . . . . . . . . . . . . . . . . 30
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 32

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1.  Introduction

   This document specifies the payload formats for packetization of
   EVRC-NW encoded speech signals into the real-time transport protocol
   (RTP).  It defines support for the header-free, interleaved/bundled
   and compact bundle packet formats for the EVRC-NW codec as well as
   discontinuous transmission (DTX) support for EVRC-NW encoded speech
   transported via RTP.  The EVRC-NW codec offers better speech quality
   than the EVRC and EVRC-B codecs and better capacity than EVRC-WB
   codec.  EVRC-NW belongs to the EVRC family of codecs.